I think Titans in general are pretty obnoxious. The power creep is just insane with those cards. Blizzard could have at least balanced them a bit by giving them requirements, either in the form of deck building or gameplay requirements like "can be played when you have dealt 10 damage with weapons this game". I like the days when cards were at least sort of balanced. Nowadays they just add blatantly OP cards to the game that are no-brainers to include in your deck.
Don't get me wrong: the theme of Titans being super powerful with special abilities is really cool. But just like with Hero cards, I dislike how they tend to be OP without any requirement to play them.
I'm ok with the strength of Titans personally, there are more overpowered legendaries like Odin and Sif that I dislike playing against. What I do not like are the ways that certain classes can steal the Titans (eg. Mage's reverbation, priest's duplicate) - don't wanna fight so many Titans in a game, lol.